Then whats the use of having 5 different UVH modes to level up into. There HAS to be a difference in drops. Maybe not in lego drop rates, I can see those being a set % drop rate, but definitely in the quality of the purps youre seeing. The AI told me there is an increase of about 2% in lego drop rates the higher in tier you go.
Chat GPT just told me that while the stats on loot do not change, In UVH3-UVH5 has exclusives like firmware weapons (Im assuming grenade slot) and mythic class mods and the quantity of loot is more.

Key Takeaways
• Gear Stats: Same across UVH1–UVH5. A Hot Slugger in UVH1 = same stats in UVH5.
• Loot Volume & Rarity: Each rank increases the chance of rare/legendary drops, plus more Eridium and cash.
• Exclusives: UVH3–UVH5 introduce items you cannot get in lower tiers (Firmware, mythic mods, cosmetics).
• Efficiency: Farming UVH5 is the most time-efficient way to target bosses for exclusives.

Sources: Maxroll’s Ultimate Vault Hunter Guide [1], Mobalytics UVH unlock guide [2], and Steam community confirmations [3].
Bottom Line
• Yes, people tested it.
• Stats don’t change between UVH1–UVH5.
• Drop rates, loot volume, and exclusive availability do.
So when someone says “loot is the same,” they’re only half right — the numbers on the gun are the same, but the odds of getting it (and rolling rare parts) are much better in UVH5.
IDK, i tend to believe this explanation. So when youre farming for a legendary, sure, do it in a lower tier. But when you want some rare ass purple with rare rolls, do it in UVH5. In my personal experience I get what seems like way more firmware and way more tripe and even quad licensed guns which are all the crazy fun shit.